Rollable display device and rollable device

ABSTRACT

A rollable display device includes a rollable display and a first protection film disposed on a first surface of the rollable display. The first protection film extends beyond a first display edge of the rollable display. The rollable display device further includes a second protection film disposed on a second surface of the rollable display facing the first surface of the rollable display. The second protection film extends beyond the first display edge of the rollable display. The rollable display device additionally includes a first adhesive layer disposed between the rollable display and the first protection film. The rollable display device further includes second adhesive layer disposed between the rollable display and the second protection film, and a first adhesion part disposed adjacent to the first display edge of the rollable display and between the first protection film and the second protection film.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.16/398,982 filed on Apr. 30, 2020, which is a divisional of U.S. patentapplication Ser. No. 15/636,763, filed on Jun. 29, 2017, now U.S. Pat.No. 10,303,217, issued on May 28, 2019, which claims priority under 35U.S.C. § 119 to Korean Patent Application No. 10-2016-0085680 filed onJul. 6, 2016 in the Korean Intellectual Property Office, the disclosuresof which are incorporated by reference herein in their entireties.

TECHNICAL FIELD

One or more exemplary embodiments of the present inventive conceptrelate to a display apparatus, and more particularly, to a rollabledisplay device and a rollable device.

DISCUSSION OF THE RELATED ART

A display device is a device displaying an image, and a rollable displaydevice has been under development.

The rollable display device is a device including a rollable displaythat is made of a flexible material and may be rolled around a roller ormay be unrolled from the roller. The rollable display may be rolledaround the roller so that a size of the entire rollable display devicemay be reduced, thereby being portable.

SUMMARY

An exemplary embodiment provides a rollable display device and arollable device suppressing a strain due to a stress generated whenbeing rolled to a roller.

According to an exemplary embodiment of the present inventive concept, arollable display device includes a rollable display and a firstprotection film disposed on a first surface of the rollable display. Thefirst protection film extends beyond a first display edge of therollable display. The rollable display device further includes a secondprotection film disposed on a second surface of the rollable displayfacing the first surface of the rollable display. The second protectionfilm extends beyond the first display edge of the rollable display. Therollable display device additionally includes a first adhesive layerdisposed between the rollable display and the first protection film. Therollable display device further includes second adhesive layer disposedbetween the rollable display and the second protection film, and a firstadhesion part disposed adjacent to the first display edge of therollable display and between the first protection film and the secondprotection film.

According to an exemplary embodiment of the present inventive concept, arollable display device, and a roller extending in a first direction andfixed to a first edge of the rollable display device. The first edgeextends in the first direction. The rollable display device includes arollable display. A first display edge of the rollable display issupported by the roller. The rollable display device further includes afirst protection film disposed on a first surface of the rollabledisplay. The first protection film extends beyond the first display edgeof the rollable display. The rollable display device additionallyincludes a second protection film disposed on a second surface of therollable display facing the first surface of the rollable display. Thesecond protection film extends beyond the first display edge of therollable display. The rollable display device further includes a firstadhesive layer disposed between the rollable display and the firstprotection film, a second adhesive layer disposed between the rollabledisplay and the second protection film, and a first adhesion partdisposed adjacent to the first display edge and between the firstprotection film and the second protection film.

According to an exemplary embodiment, the rollable display device andthe rollable device of which deformation due to stress generated whenbeing rolled to the roller is suppressed are provided.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a rollable device according to anexemplary embodiment of the present inventive concept.

FIG. 2 is a top plan view of a rollable display device according to anexemplary embodiment of the present inventive concept.

FIG. 3 is a cross-sectional view taken along a line III-Ill shown inFIG. 2.

FIG. 4 and FIG. 5 are cross-sectional views to explain an effect of arollable display device according to an exemplary embodiment of thepresent inventive concept.

FIG. 6 is a cross-sectional view of a rollable display device accordingto an exemplary embodiment of the present inventive concept.

FIG. 7 is a cross-sectional view of a rollable display device accordingto an exemplary embodiment of the present inventive concept.

FIG. 8 is a cross-sectional view of a rollable display device accordingto an exemplary embodiment of the present inventive concept.

FIG. 9 is a cross-sectional view of a rollable display device accordingto an exemplary embodiment of the present inventive concept.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Exemplary embodiments of the present inventive concept will be describedmore fully hereinafter with reference to the accompanying drawings.

In order to clearly explain the present invention, the same referencenumerals are attached to the same or similar constituent elementsthrough the entire specification.

The drawings and description are to be regarded as illustrative innature and not restrictive. In the drawings, the thickness of layers,films, panels, regions, etc., may be exaggerated for clarity. Inaddition, in the drawings, for better understanding and ease ofdescription, the thicknesses of some layers and areas may beexaggerated.

It will be understood that when an element such as a layer, film,region, or substrate is referred to as being “on” another element, itmay be directly on the other element or intervening elements may also bepresent. Further, throughout the specification, “on” implies beingpositioned above or below a target element and does not imply beingnecessarily positioned on the top in a gravity direction.

Now, a rollable device according to an exemplary embodiment will bedescribed with reference to FIG. 1.

FIG. 1 is a perspective view of a rollable device according to anexemplary embodiment of the present inventive concept.

As shown in FIG. 1, the rollable device according to an exemplaryembodiment of the present inventive concept includes a roller 2000 and arollable display device 1000.

The roller 2000 extends in a first direction (e.g., x-axis direction).The roller 2000 rotates in a counterclockwise direction, and therollable display device 1000 may be rolled towards and around the roller2000 in a second direction (e.g., y-axis direction) crossing the firstdirection. The roller 2000 rotates in a clockwise direction and therollable display device 1000 may be unrolled from the roller 2000 in thesecond direction. However, exemplary embodiments of the presentinventive concept are not limited thereto. For example, the roller 2000may rotate in the clockwise direction, and rollable display device 1000may be rolled towards and around the roller 2000 in a second direction.Alternatively, the roller 2000 may rotate in the counterclockwisedirection, and the rollable display device 1000 may be unrolled from theroller 2000 in the second direction. A third direction (e.g., z-axisdirection) is a direction crossing the first direction X and the seconddirection Y, and may be a thickness direction of the rollable displaydevice 1000. Further, the third direction may extend in a directionperpendicular to the first direction and the second direction.

The rollable display device 1000 displays an image. The rollable displaydevice 1000 may be rolled to the roller 2000 in the second direction,and may be unrolled from the roller 2000 in the second direction. Therollable display device 1000 includes a first device edge 1001 that isat one end along the first direction and a second device edge 1002 thatis opposite to the first device edge 1001 along the first direction. Thefirst device edge 1001 may be fixed to the roller 2000, and the seconddevice edge 1002 may be rolled toward the roller 2000, when the rollabledisplay device 1000 is being rolled to the roller 2000, or may beunrolled away from the roller 2000, when the rollable display device1000 is being unrolled from the roller 2000.

Next, the rollable display device 1000 according to an exemplaryembodiment of the present inventive concept will be described withreference to FIG. 2 and FIG. 3. The rollable display device according toan exemplary embodiment of the present inventive concept is a rollabledisplay device 1000 included in the above-described rollable displaydevice 1000 according to an exemplary embodiment of the presentinventive concept.

FIG. 2 is a top plan view of a rollable display device according to anexemplary embodiment of the present inventive concept. FIG. 3 is across-sectional view taken along a line III-III shown in FIG. 2.

As shown in FIG. 2 and FIG. 3, the rollable display device 1000 mayinclude the rollable display 100, a first protection film 200, a secondprotection film 300, a first adhesive layer 400, a second adhesive layer500, and a first adhesion part 600.

The rollable display 100 may include flexible substrates and/or filmsthat may face one another. In addition, the rollable display 100 mayinclude a liquid crystal layer, an organic light emitting diodes, anelectronic ink, or the like. The rollable display 100 may be atransparent type or a light transmissive type. The rollable display 100may include a touch sensor. The touch sensor may be, for example, atouch film, a touch sheet, a touch pad, or the like. The touch sensormay sense a touch input on a surface (e.g., a front surface) of therollable display 100. The rollable display 100 includes a first displayedge 101 that is one end portion of the rollable display 100 and extendsalong the first direction. The first display edge 101 of the rollabledisplay 100 is adjacent to the first device edge 1001 of the rollabledisplay device 1000. The first device edge 1001 of the rollable displaydevice 1000 extends along the first direction. The first display edge101 of the rollable display 100 is supported by the roller 2000 byfixing the first device edge 1001 of the rollable display device 1000 tothe roller 2000.

The first protection film 200 is disposed on the front surface of therollable display 100. The first protection film 200 may cover therollable display 100. Further, the first protection film 200 covers thefirst display edge 101 of the rollable display 100. In addition, thefirst protection film 200 extends in the second direction and beyond thefirst display edge 101 of the rollable display 100.

The second protection film 300 is disposed on a lower surface of therollable display 100. The second protection film 300 covers the rollabledisplay 100. Further, the second protection film 300 covers the firstdisplay edge 101 of the rollable display 100. In addition, the secondprotection film 300 extends in the second direction and beyond the firstdisplay edge 101 of the rollable display 100.

As the second protection film 300 and the first protection film 200extend beyond the first display edge 101, a space is formed between thesecond protection film 300 and the first protection film 200. Further,the space corresponds to the first display edge 101. For example, thespace is adjacent to the first display edge 101. The first adhesion part600 is disposed in the space formed between the second protection film300 and the first protection film 200.

The first adhesive layer 400 is disposed between the rollable display100 and the first protection film 200. The first adhesive layer 400 isin contact with the rollable display 100 and the first protection film200. The first protection film 200 is adhered to the front surface ofthe rollable display 100 by the first adhesive layer 400.

The second adhesive layer 500 is disposed between the rollable display100 and the second protection film 300. The second adhesive layer 500 isin contact with the rollable display 100 and the second protection film300. The second protection film 300 is adhered to the lower surface ofthe rollable display 100 by the second adhesive layer 500.

The first adhesive layer 400 and the second adhesive layer 500 include apressure sensitive adhesive so that one configuration may be attached toor detached from other configurations. The first adhesive layer 400 andthe second adhesive layer 500 have an adhesive force. The first adhesivelayer 400 and second adhesive layer 500 be sticky (e.g., may stick to aconfiguration). The first adhesive layer 400 has a higher adhesionstrength than that of the first adhesion part 600. Further, the secondadhesive layer 500 has a higher adhesion strength than that of the firstadhesion part 600.

The first adhesion part 600 is adjacent to the first display edge 101.The first adhesion part 600 is disposed in a space formed by the firstprotection film 200, the second protection film 300 and the firstdisplay edge 101. The first adhesion part 600 may be in contact with thefirst protection film 200, the second protection film 300 and the firstdisplay edge 101, which is between the first protection film 200 and thesecond protection film 300.

The first adhesion part 600 includes an adhesive selected from, forexample, at least one among polyurethane, silicon, acryl, and the like,of which the adherence may be provided in a manufacturing process of therollable display device 1000, but the adherence may be eliminated afterthe manufacturing of the rollable display device 1000. Since theadherence of the first adhesion part 600 may be eliminated after themanufacturing of the rollable display device 1000, the adhesion strengthof the first adhesive layer 400 is then higher than that of the firstadhesion part 600 and adhesion strength of the second adhesive layer 500is then higher than that of the first adhesion part 600.

The first adhesion part 600 may be cured by a curing means such as byapplying ultraviolet rays or heat in the manufacturing process of therollable display device 1000. The first adhesion part 600 has a largemodulus of elasticity. The first adhesion part 600 may include anelastomer with a larger modulus of elasticity than that of the firstadhesive layer 400 and the second adhesive layer 500. The first adhesionpart 600 extends in the first direction parallel to the first displayedge 101.

Next, an effect of the rollable display device according to an exemplaryembodiment of the present inventive concept will be described withreference to FIG. 4 and FIG. 5.

FIG. 4 and FIG. 5 are cross-sectional views to explain an effect of arollable display device 1000 according to an exemplary embodiment of thepresent inventive concept. FIG. 4 is a cross-sectional view showing arollable display device 10 without the first adhesion part 600.

As shown in FIG. 4, the rollable display device 10 without the firstadhesion part 600 includes a first edge 11, extending in the firstdirection, fixed to the roller 2000 and a second edge 12, extending inthe first direction, that may be unrolled away from the roller 2000. Inother words, the first edge 11 is the end of the rollable display device10 nearest the roller 2000, and the second edge 12 is the end of therollable display device 10 opposite that of the first edge 11.

If the rollable display device 10 is rolled around the roller 2000,stress may be generated in the rollable display device 10. For example,as the rollable display 100, the first protection film 200, and thesecond protection film 300 of the rollable display device 10 are rolledaround the roller 2000, stress may be generated in the first adhesivelayer 400 disposed between the rollable display 100 and the firstprotection film 200 and in the second adhesive layer 500 disposedbetween the rollable display 100 and the second protection film 300.

Because of this stress, a strain such as a shear strain may be generatedin the first adhesive layer 400 and the second adhesive layer 500 thathave adhesive.

As described above, as the strain is generated in the first adhesivelayer 400 and the second adhesive layer 500, at least a portion of thefirst protection film 200 and/or the second protection film 300 may beseparated from the rollable display 100.

Also, in a state that the first adhesive layer 400 and the secondadhesive layer 500 may be strained, as the first protection film 200 andthe second protection film 300 are attached to the rollable display 100and the rollable display device 10 is unrolled from the roller 2000, therollable display device 10 is not unrolled to be substantially flat, butis unrolled to be in a curved state.

FIG. 5 is a view of a rollable display device according to an exemplaryembodiment of the present inventive concept including a first adhesionpart 600.

As shown in FIG. 5, the rollable display device 1000 according to anexemplary embodiment of the present inventive concept, including thefirst adhesion part 600, includes the first device edge 1001 fixed tothe roller 2000 and the second device edge 1002 that may be unrolledfrom the roller 2000. Further, the second device edge 1002 of therollable display device 1000 is opposite to the first device edge 1001of the rollable display device 1000.

If the rollable display device 1000 is rolled around the roller 2000,stress may be generated in the rollable display device 1000. Forexample, as the rollable display 100, the first protection film 200 andthe second protection film 300 of the rollable display device 1000 arerolled around the roller 2000, and stress may be generated in the firstadhesive layer 400 disposed between the rollable display 100 and thefirst protection film 200 and in the second adhesive layer 500 disposedbetween the rollable display 100 and the second protection film 300.

According to an exemplary embodiment of the present inventive concept,if the stress is generated in the first adhesive layer 400 and thesecond adhesive layer 500, the strain due to the stress may besuppressed from being generated in the first adhesive layer 400 andsecond adhesive layer 500. The strain may be reduced or suppressed by anadhesion part 600 being in contact with and adhered to the first displayedge 101, the first protection film 200, and the second protection film300.

Also, as the first adhesion part 600 includes the elastomer having alarger modulus of elasticity than that of the first adhesive layer 400and the second adhesive layer 500 and since elastic deformation isgenerated in the state when the first adhesion part 600 is adhered tothe first display edge 101 of the rollable display 100, the firstprotection film 200, and the second protection film 300 because of thestress generated due to the bending of the rollable display device 1000(e.g., rollable display 100, the first protection film 200, and thesecond protection film 300), the stress generated in the first adhesivelayer 400 and the second adhesive layer 500 may deteriorate such thatthe strain, such as the shear strain, may be reduced or suppressed inthe first adhesive layer 400 and the second adhesive layer 500.

As described above, as deformation of the first adhesive layer 400 andthe second adhesive layer 500, by being bent, is suppressed, at leastone portion of the first protection film 200 and the second protectionfilm 300 is prevented from being separated from the rollable display100.

Also, in a state that the first adhesive layer 400 and the secondadhesive layer 500 are not deformed, as the first protection film 200and the second protection film 300 adhere to the rollable display 100and the rollable display device 1000 is unrolled from the roller 2000,the rollable display device 1000 does not maintain the curved state, butis unrolled into a substantially flat state.

Accordingly, the rollable display device 1000 that reduces or suppressesdeformation due to the stress generated when being rolled to the roller2000 is provided.

Next, the rollable display device according to an exemplary embodimentof the present inventive concept will be described with reference toFIG. 6. Hereinafter, differences from the above-described rollabledisplay device 1000 according to an exemplary embodiment of the presentinventive concept will be described.

FIG. 6 is a cross-sectional view of a rollable display device accordingto an exemplary embodiment of the present inventive concept.

As shown in FIG. 6, the rollable display device 1000, according to anexemplary embodiment of the present inventive concept, includes therollable display 100, the first protection film 200, the secondprotection film 300, the first adhesive layer 400, the second adhesivelayer 500, and the first adhesion part 600.

The first adhesion part 600 extends beyond an edge 201 of the firstprotection film 200 and an edge 301 of the second protection film 300from between the first protection film 200 and the second protectionfilm 300. The first adhesion part 600 is in contact with the edge 201 ofthe first protection film 200 and the edge 301 of the second protectionfilm 300. The first adhesion part 600 has a “T”-like shape; howeverexemplary embodiments are not limited thereto.

As described above, in the rollable display device 1000 according to anexemplary embodiment of the present inventive concept, the firstadhesion part 600 is in contact with the first display edge 101 of therollable display 100, the first protection film 200, and the secondprotection film 300, and is simultaneously in contact with the edge 201of the first protection film 200 and the edge 301 of the secondprotection film 300. Further, the first adhesion part 600 adheres to thefirst display edge 101, the first protection film 200, and the secondprotection film 300, such that the strain, such as the shear strain, issuppressed from being generated in the first adhesive layer 400 and thesecond adhesive layer 500 with the adhesive.

Accordingly, the rollable display device 1000 that reduces or suppressesa deformation due to the stress generated when being rolled to theroller is provided.

Next, the rollable display device 1000 according to an exemplaryembodiment of the present inventive concept will be described withreference to FIG. 7. Hereinafter, differences from the above-describedrollable display device 1000 according to an exemplary embodiment of thepresent inventive concept will be described.

FIG. 7 is a cross-sectional view of a rollable display device 1000according to another exemplary embodiment of the present inventiveconcept.

As shown in FIG. 7, the rollable display device 1000, according to anexemplary embodiment of the present inventive concept, includes therollable display 100, the first protection film 200, the secondprotection film 300, the first adhesive layer 400, the second adhesivelayer 500, and the first adhesion part 600.

A surface 202 of the first protection film 200 in contact with an uppersurface of the first adhesion part 600 and a surface 302 of the secondprotection film 300 in contact with a lower surface of the firstadhesion part 600, and both surfaces 202 and 302 have protrusions anddepressions in an alternating arrangement. The upper and lower surfacesof the first adhesion part 600 have protrusions and depressions in analternating arrangement that corresponds to the surface 202 of the firstprotection film 200 and the surface 302 of the second protection film300. For example, a protrusion from the upper surface of the firstadhesion part 600 corresponds to (e.g., fits into) a depression of thesurface 202 of the first protection film 200.

Accordingly, in the rollable display device 1000 according to anexemplary embodiment of the present inventive concept, as the firstadhesion part 600 is in contact with the first protection film 200 andthe second protection film 300 with the protrusions and depressions inan alternating arrangement while being in contact with the first displayedge 101 of the rollable display 100 and since a contact area betweenthe first adhesion part 600 and the first protection film 200 and acontact area between the first adhesion part 600 and the secondprotection film 300 are both increased, the first display edge 101, thefirst protection film 200, and the second protection film 300 are firmlyadhered to one another and the first adhesion part 600. Accordingly, thestrain, such as the shear strain, is suppressed from being generated inthe first adhesive layer 400 and the second adhesive layer 500 with theadhesive.

Accordingly, the rollable display device 1000 that reduces or suppressesdeformation due to the stress generated when being rolled to the roller2000 is provided.

Next, the rollable display device 1000 according to an exemplaryembodiment of the present inventive concept will be described withreference to FIG. 8. Hereinafter, differences from the above-describedrollable display device 1000 according to an exemplary embodiment of thepresent inventive concept will be described.

FIG. 8 is a cross-sectional view of a rollable display device 1000according to an exemplary embodiment of the present inventive concept.

As shown in FIG. 8, the rollable display device 1000, according to anexemplary embodiment of the present inventive concept, includes therollable display 100, the first protection film 200, the secondprotection film 300, the first adhesive layer 400, the second adhesivelayer 500, the first adhesion part 600, and the second adhesion part700.

The rollable display 100 includes a second display edge 102 opposite thefirst display edge 101 of the rollable display 100 extending in thefirst direction. The second display edge 102 of the rollable display 100is adjacent to the second device edge 1002 of the rollable displaydevice 1000 that extends in the first direction. The second display edge102 of the rollable display 100 is a part that is unrolled away from theabove-described roller 2000. The second display edge 102 of the rollabledisplay 100 extends in the first direction crossing the second directionY.

The first protection film 200 covers the second display edge 102 of therollable display 100. In addition, the first protection film 200 extendsin the second direction and beyond the second display edge 102 of therollable display 100.

The second protection film 300 covers the second display edge 102 of therollable display 100. In addition, the second protection film 300extends in the second direction and beyond the second display edge 102of the rollable display 100.

As the second protection film 300 and the first protection film 200extend beyond the second display edge 102, a space is formed between thesecond protection film 300 corresponding to the second display edge 102and the first protection film 200. The second adhesion part 700 isdisposed in the space formed between the second protection film 300 andthe first protection film 200.

The second adhesion part 700 is adjacent to the second display edge 102.The second adhesion part 700 is disposed at the space formed by thefirst protection film 200, the second protection film 300, and thesecond display edge 102. The second adhesion part 700 may be in contactwith the first protection film 200, the second protection film 300, andthe second display edge 102, which is between the first protection film200 and the second protection film 300.

The second adhesion part 700 includes the adhesive selected from, forexample, at least one among polyurethane, silicon, acryl, and the like,that has the adherence in the manufacturing process of the rollabledisplay device 1000, but the adherence may be eliminated after themanufacturing of the rollable display device 1000. Since the adherenceof the second adhesion part 700 may be eliminated after themanufacturing of the rollable display device 1000, the first adhesivelayer 400 and the second adhesive layer 500 each have a greater adhesionstrength than that of the second adhesion part 700.

The second adhesion part 700 may be cured by the curing means such as byapplying ultraviolet rays or heat in the manufacturing process of therollable display device 1000. The second adhesion part 700 has a largemodulus of elasticity. The second adhesion part 700 may include theelastomer with a larger modulus of elasticity than that of the firstadhesive layer 400 and the second adhesive layer 500. The secondadhesion part 700 extends in the first direction parallel to the seconddisplay edge 102.

The second adhesion part 700 may have a different modulus of elasticityfrom the first adhesion part 600. For example, the second adhesion part700 may have a larger modulus of elasticity than that of the firstadhesion part 600. As another example, the second adhesion part 700 mayhave a smaller modulus of elasticity than that of the first adhesionpart 600.

As described above, for the rollable display device 1000 according to anexemplary embodiment of the present inventive concept, if the rollabledisplay device 1000 is rolled around the roller 2000, (e.g., as therollable display 100, the first protection film 200, and the secondprotection film 300 of the rollable display device 1000 are rolledaround the roller) stress is generated in the first adhesive layer 400disposed between the rollable display 100 and the first protection film200 and in the second adhesive layer 500 disposed between the rollabledisplay 100 and the second protection film 300.

Although the stress is generated, the first adhesion part 600 is incontact with and adhered between the first display edge 101, the firstprotection film 200, and the second protection film 300, such that thestrain, such as the shear strain, is suppressed from being generated inthe first adhesive layer 400 and the second adhesive layer 500 with theadhesive. Further, the second adhesion part 700 is in contact with andadhered between the second display edge 102 of the rollable display 100unrolled from the roller, the first protection film 200, and the secondprotection film 300, such that the strain, such as the shear strain, issuppressed from being generated in the first adhesive layer 400 and thesecond adhesive layer 500 with the adhesive.

Also, as the first adhesion part 600 and the second adhesion part 700each includes the elastomer having the larger modulus of elasticity thanthat of the first adhesive layer 400 and the second adhesive layer 500and since the elastic deformation is generated in the state when thefirst adhesion part 600 and the second adhesion part 700 adhere to thefirst and second display edge 101 and 102 of the rollable display 100,respectively, the first protection film 200, and the second protectionfilm 300 because of the stress generated due to the bending of therollable display 100, the first protection film 200, and the secondprotection film 300, the stress generated in the first adhesive layer400 and the second adhesive layer 500 is reduced such that thedeformation, such as the shear strain, is suppressed from beinggenerated in the first adhesive layer 400 and the second adhesive layer500.

As described above, as deformation of the first adhesive layer 400 andthe second adhesive layer 500, by being bent, is suppressed, at leastone portion of the first protection film 200 and the second protectionfilm 300 is prevented from being separated from the rollable display100.

Also, as the first protection film 200 and the second protection film300 are attached to the rollable display 100 in the state that the firstadhesive layer 400 and the second adhesive layer 500 are not deformed,even if the rollable display device 1000 is unrolled from the roller,the rollable display device 1000 does not maintain the curved state, butis unrolled into the substantially flat state.

Accordingly, the rollable display device 1000 that reduces or suppressesdeformation due to the stress generated when being rolled to the roller2000 is provided.

Next, the rollable display device 1000 according to an exemplaryembodiment of the present inventive concept will be described withreference to FIG. 9. Hereinafter, differences from the rollable displaydevice 1000 according to an exemplary embodiment of the presentinventive concept will be described.

FIG. 9 is a cross-sectional view of a rollable display device 1000according to an exemplary embodiment of the present inventive concept.

As shown in FIG. 9, the rollable display device 1000 according to anexemplary embodiment of the present inventive concept includes therollable display 100, the first protection film 200, the secondprotection film 300, the first adhesive layer 400, the second adhesivelayer 500, the first adhesion part 600, a second adhesion part 700, athird adhesion part 800, and a fourth adhesion part 900.

The rollable display 100 includes the second display edge 102 oppositethe first display edge 101 of the rollable display 100 extending in thefirst direction, a third display edge 103 connecting the first displayedge 101 and the second display edge 102, and a fourth display edge 104opposite the third display edge 103 extending in the second directionand connecting the first display edge 101 and the second display edge102.

The first protection film 200 covers the first display edge 101, thesecond display edge 102, the third display edge 103, and the fourthdisplay edge 104 of the rollable display 100. In addition, the firstprotection film 200 extends in the second direction and beyond the firstdisplay edge 101 and the second display edge 102 of the rollable display100. Further, the first protection film 200 extends in the firstdirection and beyond the third display edge 103 and the forth displayedge 104 of the rollable display 100.

The second protection film 300 covers the first display edge 101, thesecond display edge 102, the third display edge 103, and the fourthdisplay edge 104 of the rollable display 100. In addition, the secondprotection film 300 extends in the second direction and beyond the firstdisplay edge 101 and the second display edge 102 of the rollable display100. Further, the second protection film 300 extends in the firstdirection and beyond the third display edge 103 and the forth displayedge 104 of the rollable display 100.

As the second protection film 300 and the first protection film 200extends beyond the first display edge 101, the second display edge 102,the third display edge 103, and the fourth display edge 104, a space isformed between the second protection film 300 and the first protectionfilm 200 that corresponds to the first display edge 101, the seconddisplay edge 102, the third display edge 103, and the fourth displayedge 104. The first adhesion part 600, the second adhesion part 700, thethird adhesion part 800, and the fourth adhesion part 900 are disposedin the space formed between the second protection film 300 and the firstprotection film 200 corresponding (e.g., adjacent) to the first displayedge 101, the second display edge 102, the third display edge 103, andthe fourth display edge 104 of the rollable display 100.

The second adhesion part 700 is in contact with the first protectionfilm 200, the second protection film 300, and the second display edge102 between the first protection film 200 and the second protection film300.

The third adhesion part 800 is in contact with the first protection film200, the second protection film 300, and the third display edge 103between the first protection film 200 and the second protection film300.

The fourth adhesion part 900 is in contact with the first protectionfilm 200, the second protection film 300, and the fourth display edge104 between the first protection film 200 and the second protection film300.

The first adhesion part 600, the second adhesion part 700, the thirdadhesion part 800, and the fourth adhesion part 900 are connected withone another and may be integrally formed. However, exemplary embodimentsof the present inventive concept are not limited thereto. For example,the first adhesion part 600, the second adhesion part 700, the thirdadhesion part 800, and the fourth adhesion part 900 may be separate fromone another.

The first adhesion part 600, the second adhesion part 700, the thirdadhesion part 800, and the fourth adhesion part 900 include the adhesiveincluding at least one among, for example, polyurethane, silicon, acryl,and the like, that has the adherence in the manufacturing process of therollable display device 1000, but the adherence may be eliminated afterthe manufacturing of the rollable display device 1000. Since theadherence of the first adhesion part 600, the second adhesion part 700,the third adhesion part 800, and the fourth adhesion part 900 may beeliminated after the manufacturing of the rollable display device 1000,the first adhesive layer 400 and the second adhesive layer 500 each havea greater adhesion strength than that of the first adhesion part 600,the second adhesion part 700, the third adhesion part 800, and thefourth adhesion part 900.

The first adhesion part 600, the second adhesion part 700, the thirdadhesion part 800, and the fourth adhesion part 900 may be cured by thecuring means such as by applying ultraviolet rays or heat in themanufacturing process of the rollable display device 1000. The firstadhesion part 600, the second adhesion part 700, the third adhesion part800, and the fourth adhesion part 900 have the large modulus ofelasticity. The first adhesion part 600, the second adhesion part 700,the third adhesion part 800, and the fourth adhesion part 900 mayinclude the elastomer having a larger modulus of elasticity than that ofthe first adhesive layer 400 and the second adhesive layer 500.

As described above, for the rollable display device 1000 according to anexemplary embodiment of the present inventive concept, if the rollabledisplay device 1000 is rolled around the roller 2000, (e.g., as therollable display 100, the first protection film 200, and the secondprotection film 300 of the rollable display device 1000 are rolledaround the roller 2000) stress is generated in the first adhesive layer400 disposed between the rollable display 100 and the first protectionfilm 200 and in the second adhesive layer 500 disposed between therollable display 100 and the second protection film 300.

Although the stress is generated, the first adhesion part 600, thesecond adhesion part 700, the third adhesion part 800, and the fourthadhesion part 900 adhere respectively between the first display edge101, the first protection film 200, and the second protection film 300,between the second display edge 102, the first protection film 200, andthe second protection film 300, between the third display edge 103, thefirst protection film 200, and the second protection film 300, andbetween the fourth display edge 104, the first protection film 200, andthe second protection film 300. Accordingly, the strain, such as theshear strain, is suppressed from being generated in the first adhesivelayer 400 and the second adhesive layer 500 with the adhesive.

Also, as the first adhesion part 600, the second adhesion part 700, thethird adhesion part 800, and the fourth adhesion part 900 each includethe elastomer having the larger modulus of elasticity than that of thefirst adhesive layer 400 and the second adhesive layer 500 and since theelastic deformation is generated in the state when the first adhesionpart 600, the second adhesion part 700, the third adhesion part 800, andthe fourth adhesion part 900 adhere to the display edges (101, 102, 103,and 104) of the rollable display 100, respectively, the first protectionfilm 200, and the second protection film 300 because of the stressgenerated due to the rolling (e.g., bending) of the rollable display100, the first protection film 200, and the second protection film 300,the stress generated in the first adhesive layer 400 and the secondadhesive layer 500 may deteriorates such that the deformation, such asthe shear strain, is suppressed from being generated in the firstadhesive layer 400 and the second adhesive layer 500.

As described above, as deformation of the first adhesive layer 400 andthe second adhesive layer 500, by being bent, is suppressed, at leastone portion of the first protection film 200 and the second protectionfilm 300 is prevented from being separated from the rollable display100.

Also, in a state that the first adhesive layer 400 and the secondadhesive layer 500 are not deformed, the rollable display device 1000may not maintain the curved state. For example, as the first protectionfilm 200 and the second protection film 300 are adhered to the rollabledisplay 100 and the rollable display device 1000 is unrolled from theroller 2000, the rollable display device 1000 does not maintain thecurved state, but is unrolled into the substantially flat state.

Accordingly, the rollable display device 1000 that reduces or suppressesdeformation due to the stress generated when being rolled to the roller2000 is provided.

While the present inventive concept has been particularly shown anddescribed with reference to exemplary embodiments thereof, it will beapparent to those of ordinary skill in the art that various changes inform and detail may be made thereto without departing from the spiritand scope of the present inventive concept as defined by the followingclaims.

What is claimed is:
 1. A rollable device comprising: a rollable displaydevice; and a roller extending in a first direction and fixed to a firstedge of the rollable display device, wherein the first edge extends inthe first direction, wherein the rollable display device includes: arollable display including a first surface displaying an image and asecond surface disposed on another side of the first surface, wherein afirst display edge of the rollable display and a portion of the secondsurface of the rollable display is supported by the roller; a firstprotection film disposed on the first surface of the rollable display,wherein the first protection film extends beyond the first display edgeof the rollable display; a second protection film disposed on the secondsurface of the rollable display, wherein the second protection filmextends beyond the first display edge of the rollable display; a firstadhesive layer disposed between the rollable display and the firstprotection film; a second adhesive layer disposed between the rollabledisplay and the second protection film; and a first adhesion partdisposed adjacent to the first display edge of the rollable display andbetween the first protection film and the second protection film,wherein the first protection film extends beyond a first edge of thefirst adhesive layer and a first edge of the second adhesive layeradjacent to the first display edge of the rollable display, and whereinthe first adhesion part has a larger modulus of elasticity than that ofthe first adhesive layer and the second adhesive layer.
 2. The rollabledevice of claim 1, wherein the rollable display further includes asecond display edge opposite of the first display edge, and the seconddisplay edge is unrolled away from the roller.
 3. The rollable device ofclaim 1, the first adhesion part extends parallel to the first displayedge in the first direction.
 4. The rollable device of claim 1, whereinthe first adhesion part extends beyond an edge of the first protectionfilm and beyond an edge of the second protection film, and the firstadhesion part is in contact with the edge of the first protection filmand the edge of the second protection film.
 5. The rollable device ofclaim 4, wherein the first adhesion part has a T-like shape from across-sectional view.
 6. The rollable device of claim 1, wherein thefirst adhesion part includes an elastomer.
 7. The rollable device ofclaim 1, wherein at least a portion of a surface of the first protectionfilm in contact with the first adhesion part has protrusions anddepressions in an alternating arrangement, and at least a portion of asurface of the second protection film in contact with the first adhesionpart has protrusions and depressions in an alternating arrangement. 8.The rollable device of claim 1, wherein the first adhesive layer has agreater adhesion strength than that of the first adhesion part, and thesecond adhesive layer has a greater adhesion strength than that of thefirst adhesion part.
 9. The rollable device of claim 1, wherein thefirst adhesive layer and the second adhesive layer include a pressuresensitive adhesive.
 10. A rollable device comprising: a rollable displaydevice; and a roller extending in a first direction and fixed to a firstedge of the rollable display device, wherein the first edge extends inthe first direction, wherein the rollable display device includes: arollable display including a first surface and a second surfacedisplaying an image and disposed on another side of the first surface,wherein a first display edge of the rollable display and a portion ofthe second surface of the rollable display is supported by the roller; afirst protection film disposed on the first surface of the rollabledisplay, wherein the first protection film extends beyond the firstdisplay edge of the rollable display; a second protection film disposedon the second surface of the rollable display, wherein the secondprotection film extends beyond the first display edge of the rollabledisplay; a first adhesive layer disposed between the rollable displayand the first protection film; a second adhesive layer disposed betweenthe rollable display and the second protection film; and a firstadhesion part disposed adjacent to the first display edge of therollable display and between the first protection film and the secondprotection film, wherein the first protection film extends beyond afirst edge of the first adhesive layer and a first edge of the secondadhesive layer adjacent to the first display edge of the rollabledisplay, and wherein the first adhesion part has a larger modulus ofelasticity than that of the first adhesive layer and the second adhesivelayer.
 11. The rollable device of claim 10, wherein the rollable displayfurther includes a second display edge opposite of the first displayedge, and the second display edge is unrolled away from the roller. 12.The rollable device of claim 10, the first adhesion part extendsparallel to the first display edge in the first direction.
 13. Therollable device of claim 10, wherein the first adhesion part extendsbeyond an edge of the first protection film and beyond an edge of thesecond protection film, and the first adhesion part is in contact withthe edge of the first protection film and the edge of the secondprotection film.
 14. The rollable device of claim 13, wherein the firstadhesion part has a T-like shape from a cross-sectional view.
 15. Therollable device of claim 10, wherein the first adhesion part includes anelastomer.
 16. The rollable device of claim 10, wherein at least aportion of a surface of the first protection film in contact with thefirst adhesion part has protrusions and depressions in an alternatingarrangement, and at least a portion of a surface of the secondprotection film in contact with the first adhesion part has protrusionsand depressions in an alternating arrangement.
 17. The rollable deviceof claim 10, wherein the first adhesive layer has a greater adhesionstrength than that of the first adhesion part, and the second adhesivelayer has a greater adhesion strength than that of the first adhesionpart.
 18. The rollable device of claim 10, wherein the first adhesivelayer and the second adhesive layer include a pressure sensitiveadhesive.